Improve escaping in format strings for backwards compatibility

src/dbg/commandparser.cpp

@@ -78,6 +78,9 @@ Command::Command(const String & command)
             case '{':
                 dataAppend(ch);
                 break;
+            case '\\':
+                dataAppend(ch);
+                break;
             default:
                 dataAppend('\\');
                 dataAppend(ch);
@@ -87,28 +90,50 @@ Command::Command(const String & command)
             break;
         case StringFormat:
         {
-            dataAppend(ch);
             auto nextch = i + 1 < len ? command[i + 1] : '\0';
             switch(ch)
             {
             case '{':
                 if(nextch == '{')
                 {
-                    dataAppend(nextch);
+                    dataAppend(ch);
-                    i++;
-                }
-                break;
-            case '}':
-                if(nextch == '}')
-                {
                     dataAppend(nextch);
                     i++;
                 }
                 else
                 {
+                    dataAppend(ch);
+                }
+                break;
+            case '}':
+                if(nextch == '}')
+                {
+                    dataAppend(ch);
+                    dataAppend(nextch);
+                    i++;
+                }
+                else
+                {
+                    dataAppend(ch);
                     state = Text;
                 }
                 break;
+            case '\\':
+                switch(nextch)
+                {
+                case '\"':
+                case '\\':
+                    dataAppend(nextch);
+                    i++;
+                    break;
+                default:
+                    dataAppend(ch);
+                    break;
+                }
+                break;
+            default:
+                dataAppend(ch);
+                break;
             }
         }
         break;